Details
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Task
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Resolution: Unresolved
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Major - P3
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None
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Cluster Scalability
Description
The toggle_feature_compatibility.js test shook out a fairly serious UUID upgrade/downgrade bug due to concurrency problems with createCollection (see SERVER-32851). It is no longer relevant in v4.0 and is being removed. Given its success, however, I recommend a similar test, modeled after toggle_feature_compatibilty.js, be introduced for sharding config schema changes.